<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
</head>
<!-- 访问data的数据，是会被加载到实例的 -->
<!-- 访问数据，实例.属性名 -->
<!-- 修改数据，实例.属性名=value -->
<body>
    <div id="app">
     {{mesg}}
     {{count}}
    </div>
</body>
<script>
   const app=new Vue({
    el:'#app',
    data:{
        mesg:'hello',
        count:100,
    }
   })
</script>
</html>